Chief Frame Machine Pinch Weld Collar Heavy Duty Oem Part Number 607381 April 14, 2025chiefchief, collar, duty, frame, heavy, machine, number, part, pinch, weldadmin Replacement Frame Anchoring Locking Collar fits. Chief Frame machine pinch weld stands, original part number 607380 and 607381. This part will work on. Chief pinch weld stands and Signature Hybrid, Chisum, and comes complete with pin and bolt. Share